Tag: process of digestion

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Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Lowest pH is found in

  1. Small intestine

  2. Large intestine

  3. Stomach

  4. Esophagus

  5. Mouth
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The gastric glands of stomach produce gastric juice, which contains pepsinogen, HCl, and mucus. HCl imparts highly acidic pH to stomach which in turn supports conversion of inactive pepsinogen into active pepsin. The proper acidic environment of stomach triggers the opening of one way pyrrolic sphincter which in turn allow the chyme to move into the small intestine for further digestive processes. Thus, the correct answer is option C.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

The lining of the stomach is protected by

  1. Hydrochloric acid

  2. Mucous

  3. Digestive juicies

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parietal cells in the mucosa are found in the inner lining of the stomach which secrete hydrochloric acid (HCl) into the stomach lumen, or cavity. It decreases the pH of the stomach and has corrosive nature hence can harm the stomach wall. The gastric juice consists mucous also. It gets deposits on the inner wall of the stomach to protect it from the corrosiveness of HCl.

Therefore, the correct answer is option B.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Muscles of alimentary canal are chiefly _______________.

  1. Striated and Neurogenic

  2. Unstriated and Neurogenic

  3. Striated and Myogenic

  4. Unstriated and Myogenic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The muscles of the alimentary canal are smooth (unstriated) muscles, which are involuntary. Their activity is regulated by the autonomic nervous system and intrinsic plexuses, making them neurogenic.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

In Man the zymogen or chief cells are mainly found in ______________.

  1. Cardiac part of stomach

  2. Pyloric part of stomach

  3. Duodenum

  4. Fundic part of stomach
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Zymogen or chief cells are responsible for secreting pepsinogen and are primarily located in the gastric glands of the fundic region of the stomach.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

The wall of the stomach is protected against the action of HCl by ______________.

  1. Epidermal layer

  2. Mesodermal layer

  3. Mucous layer

  4. Muscular layer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The stomach lining is protected from the highly acidic gastric juice (HCl) by a thick, alkaline mucous layer secreted by goblet cells.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Aurebach's plexus is present in between.

  1. Longitudinal and oblique muscles of stomach

  2. Oblique muscles and submucosa

  3. Circular and longitudinal muscles of stomach

  4. Submucosa and mucosa
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Auerbach's plexus (myenteric plexus) is located between the inner circular and outer longitudinal muscle layers of the alimentary canal wall.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

Proteolytic enzymes do not corrode lining of alimentary canal is

  1. They are secreted in inactive form

  2. Lining layer of alimentary canal does not contain protein

  3. The enzymes are not capable of digesting fat

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proteolytic enzymes like pepsin are secreted as inactive zymogens (pepsinogen) to prevent them from digesting the proteins that make up the stomach wall itself.

Multiple choice bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

What will happen if secretion of parietal cells of gastric glands is blocked?

  1. Gastric juice is deficient of pepsinogen

  2. Gastric juice is deficient of chymosin

  3. Deficiency of HCl leads to nonconversion of inactive pepsinogen into active pepsin

  4. Nonrelease of enterokinase from duodenal mucosa and non-conversion of trypsinogen into trypsin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gastric glands are numerous microscopic tubular glands formed by the epithelium of stomach. The parietal cells (oxyntic cells) are large and most numerous on the sidewalls of gastric glands. They secrete hydrochloric acid and castle intrinsic factor. The peptic cells (zymogen) cells of gastric glands secrete gastric digestive enzymes as proenzymes-pepsinogen and prorennin and a small amount of gastric amylase and gastric lipase. The hydrochloric acid maintains a strongly acidic pH of about 1.5 to 2.5 in the stomach. HCl converts pepsinogen and prorennin to pepsin and rennin respectively. 

So, the correct answer is 'Deficiency of HCl leads to nonconversion of inactive pepsinogen into active pepsin'.